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My classification of eccentric cam types is convenient but admittedly somewhat arbitrary. Rather than try to explain it solely in words, I'll provide this chart of typical examples:
| Class | Examples |
|---|---|
| Plate |  |
| Drilled Plate |  |
| Perforated Plate |  |
| Open | 
 No web, etc. inside the cam. |
| Semi-open |  One smaller opening, no thin web. |
| Open-web | 
 Minimal web inside the cam. |
| Asymmetrical Open-web |
 Back side of cam is angled. |
| Semi-open Web |
 More substantial web but with only one opening. |
| Semi-web | 
 Multiple holes in the web. |
| Web | 
|
| Braced | 
 |
| Drooped | 
 |
Hybrid | 
 More complex combinations. |